Please tell me: Some pages of my site are not listed in sitemap file. Which is of following sentence is correct: 1. Google will surely find those pages if they are not disallowed by robots 2. Google will find those pages but this is optional to google
3. Google will find those pages if they are linked from at least one another page AND the link is not with nofollow attribute AND they are not disallowed by robots.txt.
Use Google Webmaster Tools, it will help you find problems with your robots.txt, sitemap, etc. Look at the information about robots.txt in google help.